PASADENA, Calif. — MSNBC’s Tamron Hall says her choice to become the anchor of a crime series for Investigation Discovery was partly motivated by the feeling that she failed her sister, who was murdered in 2004 in what remains an unsolved crime.

Hall’s series, “Deadline Crime,” begins its second season this spring. Hall hasn’t talked about her own family’s story as part of the series, but she opened up about her regrets Thursday at a news conference.

“I feel that I failed my sister, because I knew there was domestic violence happening but I didn’t know what to say,” Hall said.

She said her sister had been visiting her, and then she discovered that her sister had let a person in the home who had assaulted her.

“She was beaten, my house was torn apart,” Hall said. “I kicked the person out of my house. The next morning my sister had let him back in.

“Rather than hug her and stick beside her, I kicked them both out,” Hall said. “With this show and talking to other victims, I try to teach others what I believe I did wrong, which is, I should have hugged my sister and I should have found help for her,” Hall said.

Hall said the show has given her the opportunity to let people she’s interviewing know they are not alone if they are struggling with the idea that they should have done something different for loved ones involved in tragic crimes.